why is the united states pulling back on this? former u.s. ambassador to the u.n., john bolton weighs in. >> bill: strong feelings on that. governor mitt romney make egg negative comment about his own party. why he says republicans let the american people down. what was he saying? we'll tell you. >> martha: and historical context on why national conventions are so important, even today, still. and how they really can either make or break a candidate. >> the convention of the democratic party will now be in order. >> the conventions are an opportunity for the activist in each party to get together, to drum up a great deal of enthusiasm and then to go out and try to win an election. lap >> bill: welcome back to this sunday morning, labor day weekend. we are live in charlotte. that's a preview of what we will see wednesday night. president bill clinton will take the stage. the stage is interesting of a lot of video screens. but the floor space is a lot tighter. based on what we can see at the moment here, there is a lot less floor space, which m